Thanks, Emmanuel Puybaret
Here is my trial Render-1 in HQ & it takes 6 minutes

with default settings,
-Xms1024m
-Xmx1536m
-Dcom.eteks.sweethome3d.j3d.PhotoRenderer.highQuality.globalIllumination=default
-Dcom.eteks.sweethome3d.j3d.PhotoRenderer.highQuality.diffusedBounces=1
-Dcom.eteks.sweethome3d.j3d.PhotoRenderer.highQuality.causticsPhotons=0
-Dcom.eteks.sweethome3d.j3d.PhotoRenderer.highQuality.shininessShader=silk
-Dcom.eteks.sweethome3d.j3d.PhotoRenderer.highQuality.antiAliasing.min=1
-Dcom.eteks.sweethome3d.j3d.PhotoRenderer.highQuality.antiAliasing.max=2
,
Here is my trial Render-2 in HQ & it takes 1 Hr.3minutes

with High settings,
-Xms1024m
-Xmx1536m
-Dcom.eteks.sweethome3d.j3d.PhotoRenderer.highQuality.globalIllumination=path
-Dcom.eteks.sweethome3d.j3d.PhotoRenderer.highQuality.diffusedBounces=3
-Dcom.eteks.sweethome3d.j3d.PhotoRenderer.highQuality.causticsPhotons=1000000
-Dcom.eteks.sweethome3d.j3d.PhotoRenderer.highQuality.shininessShader=default
-Dcom.eteks.sweethome3d.j3d.PhotoRenderer.highQuality.antiAliasing.min=1
-Dcom.eteks.sweethome3d.j3d.PhotoRenderer.highQuality.antiAliasing.max=2
& Here is my trial Render-3 in HQ & it takes 3minute.20Sec

with Optimize settings,
-Xms1024m
-Xmx1536m
-Dcom.eteks.sweethome3d.j3d.PhotoRenderer.highQuality.globalIllumination=path
-Dcom.eteks.sweethome3d.j3d.PhotoRenderer.highQuality.diffusedBounces=0
-Dcom.eteks.sweethome3d.j3d.PhotoRenderer.highQuality.causticsPhotons=0
-Dcom.eteks.sweethome3d.j3d.PhotoRenderer.highQuality.shininessShader=silk
-Dcom.eteks.sweethome3d.j3d.PhotoRenderer.highQuality.antiAliasing.min=1
-Dcom.eteks.sweethome3d.j3d.PhotoRenderer.highQuality.antiAliasing.max=1
It give me a lots of work experience in all the way
Thank you once again for posting information's. [=D>] , [:x]